 Officials in Minnesota say human air was to blame for a statewide 911 outage earlier this month. Minnesota's Emergency Communications Network said Wednesday it has concluded its investigation into the August 1st outage. Similar disruptions were reported in North Dakota and North Carolina. According to the agency, Century Link Minnesota's 911 service provider said human air by a third-party vendor caused the outage. Century Link says an employee of West Safety Services made a mistake while making a network configuration change. The air prevented 911 calls from being accepted in the three states. Century Link says nearly 700 calls to more than 50 Minnesota 911 dispatch centers failed to be routed during the hour-long outage. West Safety Services has agreed to stop work on its network through August while it reviews the outage.